JPH0515631Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a magnetic oil damper that is intended to be used, for example, in a vacuum and does not allow oil leakage.

[Conventional technology]

FIG. 4 shows a conventional magnetic oil damper.

In Fig. 4, 1 is the cylinder, 2 is the oil, and 3 is the cylinder.
is a housing, 4 is a hole, 6a is a first spring, 6b is a second spring, 7 is a permanent magnet, 8
is the oil case.

A conventional oil damper is configured as described above.
An impact force is applied to the oil case 8, causing the oil case 8 to fall downward, and at this time, the cylinder 1 uses magnetic coupling force to relieve the initial load, and after this, the cylinder 1 is fixed by the permanent magnet 7 and the oil 2 By moving through the hole 4 in the cylinder 1, the impact force was alleviated.

After the buffering operation is completed, the cylinder 1 and the oil case 8 are returned to the neutral position by the first spring 6a and the second spring 6b.

The oil 2 is sealed by the oil case 8 and there is no leakage at all.

[The problem that the idea attempts to solve]

In the conventional magnetic oil damper as described above, since the diameter of the hole provided in the cylinder 1 is constant, the viscous resistance of the oil 2 is affected by the temperature of the damper surrounding environment, making the characteristics of the damping effect unstable. The dot was hot.

This invention was made to solve the above problems, and the purpose is to obtain a magnetic oil damper that has stable buffering characteristics even when the temperature of the surrounding environment changes.

[Means to solve the problem]

In the temperature-compensated magnetic oil damper according to this invention, a hole diameter adjustment plate is attached to the cylinder so that the diameter of the hole 4 can be adjusted.

[Effect]

With this invention, the magnetic oil damper adjusts the moving speed of oil according to the viscous resistance of the oil using the hole diameter adjusting plate 5 of the cylinder 1, and obtains a stable damping effect that is not affected by the surrounding temperature environment.

〔Example〕

FIG. 1 shows an embodiment of the temperature compensated magnetic oil damper according to this invention. Figures 2 and 3 are the first
Hole 4 of cylinder 1 and hole diameter adjustment plate 5 in the figure
An enlarged view of the part is shown. In FIG. 1, 1 is a cylinder made of magnetic material, 2 is oil, 3 is a housing, 4 is a hole, 5 is a hole diameter adjusting plate, 6a is a first spring, 6b is a second spring, 7 is a permanent magnet, 8 is an oil case, 9 is a bimetal, and 10 is a pin joint.

Next, the functions in the above embodiment are shown in Figs. 1 and 2.
This will be explained using FIG.

Figure 1 shows the neutral state of this device, in which oil 2 must pass through hole 4 to function as a damper.
movement will be carried out. However, since the viscous resistance of the oil 2 changes depending on the temperature, the buffering effect changes. Therefore, when the temperature of the oil 2 is high, the bimetal 9 bends and the hole diameter adjusting plate 5 is adjusted to the hole 4.
(Fig. 2), and when the temperature of the oil 2 is low, the bimetal 9 expands and the hole diameter adjustment plate 5 enlarges the hole 4 (Fig. 3), thereby adjusting the moving speed of the oil. This provides stable buffering capacity.

[Effect of idea]

As described above, this invention has the effect of realizing a temperature-compensated magnetic oil damper that is not affected by the viscous resistance of oil due to temperature.

[Brief explanation of drawings]

Figure 1 is a diagram of the neutral state of the temperature-compensated magnetic oil damper according to this invention, Figure 2 is an enlarged view of the cylinder pore diameter adjustment part in a high temperature environment, and Figure 3 is an enlarged view of the cylinder pore diameter adjustment part in a low temperature environment. 4 are configuration diagrams of a conventional magnetic oil damper. In the figure, 1 is a cylinder, 2 is oil, 3 is a housing, 4 is a hole, 5 is a hole diameter adjusting plate, 6a is a first spring, 6b is a second spring, 7 is a permanent magnet, 8 is an oil case, 9 is bimetallic,
10 is a pin joint. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] a hollow cylindrical oil case whose interior is sealed; a first spring whose one end is attached to the inner wall of the oil case; and a first spring which is attached to the other end of the first spring and has a clearance with the inner wall of the oil case. The above oil case is movable in the axial direction,
A cylinder made of a magnetic material that has a small hole inside that connects the two-part inner space of the oil case, the oil filled inside the oil case, and a cylinder that is installed around the outer wall with a clearance from the outer wall of the oil case. a magnet, a housing that holds the magnet, a second spring installed between the oil case and the housing, and a second spring that is located on the surface of the cylinder that has the small hole and is movable in the radial direction of the small hole. 1. A magnetic oil damper comprising: a hole diameter adjustment plate provided in the oil case; and a drive unit that moves the hole diameter adjustment plate in accordance with temperature changes within the oil case.